Influenza, or the flu, is a common infectious disease, which can be deadly to individuals with compromised immune systems (the very young, the very old, and those with conditions such as AIDS or Cancer). However, occasionally particularly virulent strains of influenza break out that can be threatening on a much larger scale -- such as the flu epidemic of 1918 and, more recently, concerns that H5N1 "Bird Flu" could mutate into a highly-infectious and deadly virus. A number of pharmaceutical companies make treatments for the flu and benefit from the fear of a flu outbreak.
- Roche Pharmaceuticals makes Tamiflu, an antiviral pill to treat the flu. In 2005, amid concerns that bird flu might pose a large threat during the winter flu season, many national governments began stocking up on Tamiflu.
- Novartis AG (NVS), through its acquisition of Chiron in 2006, supplies much of the traditional flu vaccine supply to the United States.
- AstraZeneca (AZN), through recently acquired MedImmune, manufactures 'FluMist', a novel flu vaccine that is delivered via an intranasal spray rather than via an injection.